a=int(input())
if a<30:
  print("No")
else:
  print("Yes") a=int(input()) a int(input()) int input() input if a<30:
  print("No")
else:
  print("Yes") a<30 a 30 print("No") print "No" print("Yes") print "Yes" a=int(input()) int(input()) a
a=int(input())
if a<30:
  print("No")
else:
  print("Yes")